It's a fine line. They don't want people to conclusively prove that it's them, but they want people familiar with them to know that it most likely is them.
The interesting thing about this one is how low it was. There's a decent enough chance of surviving falling from the 3rd storey, which suggests they would have ensured his death some other way.
Maybe they'll do a Dune and have the characters whisper to themselves half the time.